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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2021.1
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- 433 - 451 (19page)
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이 논문의 연구 히스토리 (3)
2021
Zinc isotope evidence for deep carbon recycling in the mantle source of late Cenozoic basalts, Vietnam
Hoang Thi Hong Anh
,
Sung Hi Choi
한국암석학회 학술발표회 논문집
2021.08
학술대회자료
Geochemical constraints on the evolution of the lithospheric mantle beneath central and southern Vietnam
Hoang Thi Hong Anh
,
최성희
,
유용재
외 2명
Geosciences Journal
2021.01
학술저널
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We present comprehensive geochemical and isotopic (Sr-Nd-Hf) datasets for two suites of ultramafic rock in Vietnam, namely xenoliths of spinel lherzolite entrained in late Cenozoic alkali basalts, and Paleozoic ultramafic massifs that occur along the Tam Ky–Phuoc Son suture zone in central and southern Vietnam. The ultramafic massifs are the products of high degrees of melt extraction (up to 40%), and have relatively low equilibrium temperatures of 603 to 778 °C. The lherzolites are residues of relatively low degrees of fractional melting (< 1% up to 20%). The compositions of minerals in the xenoliths reveal that the late Cenozoic lithospheric mantle beneath central and southern Vietnam was hotter (825–1058 °C) than during the Paleozoic. The calculated trace element patterns of metasomatic melts that equilibrated with clinopyroxenes in the LREE-enriched xenoliths show enrichments in Th, U, and LREEs, and depletions in Nb. These data, together with the elevated Ti/Eu ratios of the clinopyroxenes, reflect the role of hydrous silicate melts as the main agents of metasomatism. The ultramafic rocks of the Paleozoic massifs contain spinel with TiO2 contents higher than expected for residual spinel, which suggests the influence of boninitic melt(s). In the lherzolite xenoliths, the clinopyroxenes have MORB-like depleted Sr-Nd-Hf isotopic compositions (87Sr/86Sr = 0.70241–0.70416; εNd = +6.6 to 12.3; εHf = +13.1 to 25.1), suggesting metasomatic melts/fluids from upwelling asthenosphere. We suggest that subduction of the (Paleo-)Pacific Plate and continental collision during the Permian–Triassic played key roles in lithospheric replacement and thinning beneath central and southern Vietnam.
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참고문헌 (98)
참고문헌 신청
An, A. R. / 2017 / Petrogenesis of Late Cenozoic basaltic rocks from southern Vietnam / Lithos 272:192~204
Arai, S. / 1994 / Characterization of spinel peridotites by olivine-spinel compositional relationships: review and interpretation / Chemical Geology 113:191~204
Ballhaus, C. / 1991 / High pressure experimental calibration of the olivine-orthopyroxene-spinel oxygen geobarometer:implications for the oxidation state of the upper mantle / Contributions to Mineralogy and Petrology 107:27~40
Bertrand, P. / 1985 / The mutual solubility of coexisting ortho- and clinopyroxene: toward an absolute geothermometer for the natural system? / Earth and Planetary Science Letters 76:109~122
Bizimis, M. / 2003 / The brevity of carbonatite sources in the mantle: evidence from Hf isotopes / Contributions to Mineralogy and Petrology 145:281~300
Arai, S. / 1994 / Characterization of spinel peridotites by olivine-spinel compositional relationships: review and interpretation / Chemical Geology 113:191~204
Ballhaus, C. / 1991 / High pressure experimental calibration of the olivine-orthopyroxene-spinel oxygen geobarometer:implications for the oxidation state of the upper mantle / Contributions to Mineralogy and Petrology 107:27~40
Bertrand, P. / 1985 / The mutual solubility of coexisting ortho- and clinopyroxene: toward an absolute geothermometer for the natural system? / Earth and Planetary Science Letters 76:109~122
Bizimis, M. / 2003 / The brevity of carbonatite sources in the mantle: evidence from Hf isotopes / Contributions to Mineralogy and Petrology 145:281~300
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